In each of the cities of this Commonwealth, there shall be a general reassessment of real estate every two years. Sections 58.1-3258, 58.1-3275, 58.1-3271, 58.1-3276, and 58.1-3278, and other relevant provisions of law shall be applicable to general reassessments of real estate in cities. Any city which has a total population of 30,000 or less, may elect by majority vote of its council to conduct its general reassessments at four-year intervals. No provision of this section shall affect the power of any city to use the annual or biennial assessment method in lieu of general assessments.